Jealousy can be described as a state of suspicion or fear caused by a real or imagined threat. Othello, a tragic hero, was ultimately led to his downfall by this critical flaw in his character. Although Iago took advantage of his gullibility, Othello was irrevocably destroyed by himself.
Othello had faced many dangers, countless wars and was a seasoned warrior,yet despite this he had many traits which made him seem unsophisticated, not very observant, naive of other   peoples intentions and corruptness and above all, he had too trusting a nature. It is because of these characteristics that Othello was malleable and Iago was able to use him for his own evil purposes.
Iago’s words to Othello, “O, beware, my Lord of jealousy. It is the green-eyed monster,” in Act 3 scene 3, proves to the audience what a deceitful man Iago really was. Ultimately his role was to merely provoke the evil that already lay dormant in Othello. He helped Othello fall prey to a powerful emotion that would inevitably guide him to murder the one he loved.
The play began in Venice, a land of peace and devoid of conflict and confusion. It was here where Othello was regarded in high esteem and as a hero. In Act 1 the Duke refers to him as “Valiant Othello”, further convincing the audience of Othello’s elevated rank in Venetian society. We also see that he had an articulate manner of speech when in Venice. Cyprus, the island Othello was commissioned to govern, was a violent place and had a turbulent nature which mirrored his emotional state and speech which became crude and uncouth. The contrasts between Cyprus and Venice were consistent with the changes that occurred in Othello. The nature of Cyprus can be compared to the deterioration of his character.
Once in Cyprus Iago planted a seed of doubt in Othello’s mind concerning Desdemona’s fidelity. The audience knows this is not true but Othello, blinded by love and jealousy was poisoned by Iago’s vile lies. It is important to...